Ostensibly a bookshop, but even if you’re not after books, don’t miss this exquisite 1906 neo-Gothic confection, with its lavishly carved plaster resembling wood and stained-glass skylight. Feels magical? Its intricately wrought, curiously twisting staircase was supposedly the inspiration for the one in the Harry Potter books, which JK Rowling partly wrote in Porto while working here as an English teacher from 1991 to 1993.

The €3 entry is redeemable if you buy a book.